/*
 * Copyright 2025 LinQingYing. and contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * The use of this source code is governed by the Apache License 2.0,
 * which allows users to freely use, modify, and distribute the code,
 * provided they adhere to the terms of the license.
 *
 * The software is provided "as-is", and the authors are not responsible for
 * any damages or issues arising from its use.
 *
 */

package org.cangnova.cangjie.project.ui.actions

import com.intellij.codeInsight.completion.CompletionParameters
import com.intellij.codeInsight.completion.CompletionResultSet
import com.intellij.codeInsight.lookup.LookupElementBuilder
import com.intellij.icons.AllIcons
import com.intellij.openapi.project.Project
import com.intellij.util.ProcessingContext
import org.cangnova.cangjie.project.model.CjProject

/**
 * 仓颉命令补全提供者接口
 *
 * 为 RunAnything 提供命令自动补全功能
 */
interface CjCommandCompletionProvider {

    /**
     * 提供命令补全建议
     *
     * @param prefix 命令前缀
     * @return 补全建议列表
     */
    fun complete(prefix: String): List<LookupElement>
}

/**
 * 基于命令提供者的补全实现
 *
 * 将 CjCommandProvider 的命令转换为 RunAnything 的补全建议
 */
class CommandProviderCompletionProvider(
    private val project: Project,
    private val projectProvider: () -> CjProject?
) : CjCommandCompletionProvider {

    override fun complete(prefix: String): List<LookupElement> {
        val providers = CjCommandProvider.EP_NAME.extensionList
        val cjProject = projectProvider()

        return providers.flatMap { provider ->
            provider.getAvailableCommands(project, cjProject)
        }.filter { command ->
            prefix.isEmpty() || command.id.startsWith(prefix) || command.displayName.startsWith(prefix, ignoreCase = true)
        }.map { command ->
            LookupElementBuilder.create(command.id, command.displayName)
                .withIcon(AllIcons.Actions.Run_anything)
                .withTailText(" (${command.description})")
                .withTypeText(command.id)
        }
    }
}

/**
 * 补全项的别名，为了代码简洁
 */
typealias LookupElement = com.intellij.codeInsight.lookup.LookupElementBuilder